I'm back from my trip. Lights worked fine as expected. Kill switch was useful offroad.

I've been making the harness one at a time. No crimping, all connections are soldered. All 12 and 14 gauge wires. (READ: time consuming) To simplify things, I will be making all of them with a kill switch for low beam. AND all of them will have low beam on, while the high beam switch is on.